Valve-grinder.



G. F. PETERSON.

VALVE GRINDER.

APPIJGATION FILED AUG. 26, 1914,

Patented Dec. 29, 1914.

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ami human (91w G. P. PETERSON.

VALVE GRINDER.

APPLICATION FILED AUG. 26, 1914.

Patented Dc. 29, 1914.

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VALVE-Garnish.

I To (in whom it may-concern:

The present invention relates to improvements in valve grinders of the portable, power driven type, especially adapted for use in grinding valves of internal combustion engines, but of course applicable for use in connection with other types of valves.

The primary object of the invention is the provision of a portable, compactly arranged valve grinder which will grind the valve while in its seat leaving it in a smooth cong dition, free from scratches and rings, and

'this object is attained by combinin and arranging the parts of the device so t at when the device is operated the valve is forced to revolve in its seat, lifted while revolving, then seated and reversed in its'movement a short distance, then lifted still revolving and then seated and again revolved a long distance ahead, the action being continued until the valve is smooth and free from all irregularities. Thus the action of the parts is that of revolving, oscillating, and reciproeating, as will be hereinafter more specifically described.

In the accompanying drawings I have illustrated one complete examp e of the physical embodiment of my invention, and a modified form of tool or attachmentused with the device, constructed accordingfto the best modes I have so far devised for the practical application of the principles of my invention.

Figure 1 is a sectional view showing the device involving my invention as applied to a portion of an internal combustion engine, in position to grind the valve. Fi 2 is a vien of a rotary member or carrier with parts-broken away for convenience of illustration. Fig. 3. is a top plan view of the rotary carrier of Fig. 2. Fig. 4 is a transverse sectional view looking upwardly on line 1-4 of Fig. 1. Fig. 5 shows an additional form of attachable tool, in the form of a screw driver.

In the preferred embodiment of my invention as illustrated in the drawings, the grinder is inclosed and carried by the three sections as the base 1, the lower housing 2 H Specification of Letters Patent. I

Application filed August as, 1914. Serial No. seam.

Patented Dec. 29, 191a.

and tl ie upper housing 3, and these sections are Jointed by means of the threads 4 and 5.

A mot0r 6, which as illustrated is a conventional form of electric motor, is carried by the upper ortion of the housing 3, and it w1ll be understood that these elements, the base, hous ngs and motor, are rigidly fixed with relation to each other, and stationary. The upper housing 3 is inthe fofm of a cylindrical open bottom shell and its partition 7 1s perforated at its center to provide for a central bearing lu 8 of the motor in which the motor shaft 3 is journaled, and this shaft carries a Worm gear 10, through which motion is imparted to the grinder.

Within the cylindrical housing 3 an open top cylindrical cup 11 is adapted to revolve, and 1t 1s horizontallyrotated from the worm gear 10, through the medium of worm Wheel 12, bevel gear 13 and counter shaft 14, the latter 3ournaled in bearing lfrackets 15 secured to the wallof the cup; and bevel pinion 16, crank shaft 17 supported in the bottom 18 of the cup, small pinion 19 on the crank shaft and idler pinion 20 j ournaled on a stud shaft or screw 21 in the bottom 18 of the cup. The idler pinion 20, as clearly seen in Fig. 4, is in mesh with a rack ring 22 formed in the interior upper end of the housing 2, and as the cup 11 revolves the idler and rack ring are at all times in engagement, and the rotary motion imparted to the idler causes this rotary motion of the cup in the upper housin l The main shaft 23 is oose in the bottom 18 of the cup and is also free to'revolve in bearings. in the upper and lower housings. A tension spring 24 ,which is inclosed by the two recesses 25 and'j26 in the two housings, surrounds the shaft 23 and has a thrust bearing the shaf-t downwardly in Fig. 1. This shaft carries'a' tool 'as 28 at its end, which in this instance is forked toflenga'ge holes in the top of the diskf-29formin'g the valve in seat 30, and thezyalve has a.- spring. 31 about its stem 32 tending-$9 lift the valve from its seat.

The upper 'end of the main shaft projects through a hub 33 formed centrally of the cup bottom 18, and a transversely extending pin 34 in the shaft has a pair of rollers 35 one at each side of the shaft. These rollers are adapted to ride over two cam faces 36 36 on the hub 33, and in doing so they cause the main shaft to reciprocate vertically (in Fig. 1) against the tension of spring 24.

'sb that the spring tends to force i From thisconstruction it will be imderstood that the main shaft revolves free of the cup 11', but the shaft however 1s revolved indirectlgefrom the cup.

A forked oscillating arm 37, fixed on the' shaft by means of the set screw 38., receives motion from the crank disk 39 on the shaft 17, the pin 40 traveling between the forked arms 41 of the arm 37 as the arm is oscillated. Thus it will be seen that as the cup revolves the shaft 23 also revolves with it,

but in addition to this revolving motion, the crank motion and oscillating arm cause the main shaft to revolve or oscillate in the hub of the cup, and the cams provide for a reciprocatory motion of the main shaft which is aided by the s ring 2-1. I

In use the va ve grinder is set directly over the valve with the base '1 resting on the engine cylinder or valve cage 42, and with the valve tool 28. engaging the valve 29 as described. The valve tool 28 is so adjusted on the lower end of the main shaft as to compress the s ring 24 and cause a downward tension 0 the spring to keep the tool 28 engaged with the valve.

Although the rollers may be lifted from the lower part of the hub edge, they are still in position to ride over the cams on the hub and lift the main shaft. When the main shaft is thus lifted, the spring 31 raises the valve disk from its seat, and the oscillating arm 37 is so timed in 1ts movement that the main shaft is oscillated while in lifted position to turn the valve disk. Bythis mechanism operated. from the motor through the described gearing and the rotating cup, the desired movement is imparte to, the disk so that its edge is ground smooth to make a perfect fit on its seat. In some instances the tool 50in Fig. 5 may be used, this tool performing the function of a the actions until the disk. is suiiiciently ground.

" Havin thus fully described my invention,

ing and connections from the motor for ro-"- tatin said cup, a main shaft loosely jour nale in the cup and provided with valveengaging means, means between the cup and -main shaft for revolving the latter, and

means for reciprocating said shaft.

2. The combination with a rotary driving cup, of a main shaft journaled in a portion of the cup reciprocable therein, means for revolving the cup, means for revolving the shaft from the cup, means on the cup' for reciprocating the shaft and means actuated by the cup for oscillating the shaft.

3. The combination in a valve grinder of a rotatable driving cup and a rotary shaft reciprocable therein, a hub on the cup having cams, and a spring resiliently supporting the shaft, and rollers supported on the shaft adapted to ride over said cams to lift the shaft.

4. The combination with a rotary driving cu journa ed therein, means carried by the cup for lifting said shaft to permit the valve to rise from its seat, and means for returning the shaft and valve to lowered position.

5. In a valve grinder, the combination with its housing and base and motor, of a main driving shaft, a rotary cup supported in a housing, a crank shaft journaled in the cup .and gears from the motor for driving the same, a pinion on the crank shaft, a rack ring. formed on the. housing and an idler between the rack ring and pinion, and an oscillating lever on themain shaft connected to the crank shaft whereby the main shaft is rotated and oscillated.

. In testimony whereof I afiix my signature in presence of two witnesses.

GEORGE E. PETERSON.

Witnesses:

. J. HENRY PnARsoN,

A. C. Runs.

a rotary main shaft reciprocably 

